Disable full group by mode whe groupContacts is TRUE

This prevents an error when using the cache and allows us to move
past this without untangling the messy way other tables are joined back in
for now.

Note it became necessary due to query changes off the cache but the query is no
different in accuracy

CRM/Contact/BAO/Query.php

@@ -4904,7 +4904,7 @@ public function searchQuery(
     //      MySQL expect the columns present in GROUP BY, must be present in SELECT clause and that results into error, needless to have other columns.
     //   2. When GROUP BY columns are present then disable FGB otherwise it demands to add ORDER BY columns in GROUP BY and eventually in SELECT
     //     clause. This will impact the search query output.
-    $disableFullGroupByMode = ($sortByChar || !empty($groupByCols));
+    $disableFullGroupByMode = ($sortByChar || !empty($groupByCols) || $groupContacts);
 
     if ($disableFullGroupByMode) {
       CRM_Core_DAO::disableFullGroupByMode();